Support for extracting IANA media type.

BUG=143998


Review URL: https://chromiumcodereview.appspot.com/10829468

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@153713 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 30 insertions, 0 deletions

diff --git a/net/base/mime_util.cc b/net/base/mime_util.cc
index 62788dc..2880fa19 100644
--- a/net/base/mime_util.cc
+++ b/net/base/mime_util.cc
@@ -17,6 +17,27 @@
 
 using std::string;
 
+namespace {
+
+struct MediaType {
+  const char name[12];
+  const char matcher[13];
+};
+
+static const MediaType kIanaMediaTypes[] = {
+  { "application", "application/" },
+  { "audio", "audio/" },
+  { "example", "example/" },
+  { "image", "image/" },
+  { "message", "message/" },
+  { "model", "model/" },
+  { "multipart", "multipart/" },
+  { "text", "text/" },
+  { "video", "video/" },
+};
+
+}  // namespace
+
 namespace net {
 
 // Singleton utility class for mime types.
@@ -871,4 +892,13 @@ void GetMediaCodecsBlacklistedForTests(std::vector<std::string>* codecs) {
 #endif
 }
 
+const std::string GetIANAMediaType(const std::string& mime_type) {
+  for (size_t i = 0; i < arraysize(kIanaMediaTypes); ++i) {
+    if (StartsWithASCII(mime_type, kIanaMediaTypes[i].matcher, true)) {
+      return kIanaMediaTypes[i].name;
+    }
+  }
+  return "";
+}
+
 }  // namespace net